How so? Flash, at his true speed, is literally impossible to see. So the interesting stuff has to be rendered as slo-mo or “bullet time” instead. And overused, this is a sfx technique which might get tiresome fairly quickly (pun intended ).

Flash doesnt need to be lightspeed in the movie.Just make him fast enough for the audience to get the message and yet slow enough for the film not to always resort to Slow mo.

One of the best displays of superspeed was in incredibles-It was always one of-if not the coolest scene in the movie.